曲げ降伏する鉄筋コンクリート梁部材の限界変形の評価

概要

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A design equation proposed by Ichinose et al. evaluates the imaginary shear strength of ductile RC members which is decreased as a function of plastic hinge rotation. In this paper, the characteristics of this equation were clarified and the requirements of RC beams for ductile failure were investigated based on the experimental data of 185 specimens from 1973 to 2010. These specimens showed various failure modes after flexural yielding. The following remarks have been found. 1) The equation showed definite relationship between plastic rotation angle and shear strength margin. Proposed coefficient C indicated rotational capacity on the same shear strength margin level. 2) The equation was effective to confirm whether RC beams had necessary ultimate deformation capacity for ductile behavior. 3) A shear reinforcement margin proposed by Ishikubo et al. had relevance to the ultimate deformation of RC beams. By using this factor, it was possible to prevent brittle shear diagonal tension failure and shear tension failure. 4) Bond splitting margin was effective to prevent shear splitting failure. However it didn't represent the ultimate deformation capacity of the specimens.
一般社団法人日本建築学会の論文
2011-03-25